PHP'；s Laravel 4在每次调用Auth类时都会命中数据库 - Does PHP's Laravel 4 hit the Database on every call to the Auth class?

Does PHP's Laravel 4 hit the Database on every call to the Auth class?

本文关键字：Auth 数据库调用 Laravel PHP | 更新日期: 2023-09-27

我正在构建我的第一个Laravel 4应用程序（PHP）。

我发现自己需要在我的大多数模型和控制器中经常调用这样的东西。。。

$this->user = Auth::user();

所以我的问题是，是在应用程序中多次调用它，多次访问数据库，还是它足够聪明，可以在请求/页面构建的剩余时间将其缓存在某个地方？

还是我需要自己做不同的事情？我浏览了一下Auth类，但没有时间检查每个文件（Auth有16个文件）

这是方法Auth::user()的代码。

// vendor/laravel/framework/src/Illuminate/Auth/Guard.php
/**
 * Get the currently authenticated user.
 *
 * @return 'Illuminate'Auth'UserInterface|null
 */
public function user()
{
    if ($this->loggedOut) return;
    // If we have already retrieved the user for the current request we can just
    // return it back immediately. We do not want to pull the user data every
    // request into the method becaue that would tremendously slow the app.
    if ( ! is_null($this->user))
    {
        return $this->user;
    }
    $id = $this->session->get($this->getName());
    // First we will try to load the user using the identifier in the session if
    // one exists. Otherwise we will check for a "remember me" cookie in this
    // request, and if one exists, attempt to retrieve the user using that.
    $user = null;
    if ( ! is_null($id))
    {
        $user = $this->provider->retrieveByID($id);
    }
    // If the user is null, but we decrypt a "recaller" cookie we can attempt to
    // pull the user data on that cookie which serves as a remember cookie on
    // the application. Once we have a user we can return it to the caller.
    $recaller = $this->getRecaller();
    if (is_null($user) and ! is_null($recaller))
    {
        $user = $this->provider->retrieveByID($recaller);
    }
    return $this->user = $user;
}

对我来说，它看起来每次请求只会从数据库中获取用户一次。所以，你可以随意调用它。它只会命中DB一次。

Auth::user()只访问DB一次，所以多次调用它不是问题。顺便说一句，你可以缓存你想经常访问的用户的有用信息。